Angelica Schuster

Glucosinolates in Capparis flexuosa of jamaican origin

Abstract The glucosinolates in dried leaves of Capparis flexuosa (L.)L., collected in Jamaica, were examined by identifying the derivatives of the isothiocyanates initially produced by their enzymic hydrolysis. Evidence is presented for the existence in the leaves of five C4 glucosinolates, viz. butyl, 3-hydroxybutyl-, 4-hydroxybutyl-, 3-butenyl-, and 2-hydroxy-3-butenylglucosinolate, the first three of which represent new natural products. The results are at variance with those obtained elsewhere on the same species from the same locality. The reasons for the discrepancy are discussed. The results also deviate from those obtained in this laboratory in a previous study of allegedly the same species, collected in Colombia. Again, the difference is commented upon.

Glucosinolates in seeds of Neslia paniculata

Abstract The glucosinolate fraction in seeds of Neslia paniculata (L.) Desv., subsp. thracica (Velen.) Bornmuller, (Cruciferae), has been isolated and subjected to enzymic hydrolysis. The isothiocyanates thus produced have been separated and identified as cheirolin (II), ( R )-9-methylsulfinylnonyl (III), ( R )-10-methylsulfinyldecyl (IV), and ( R )-11-methylsulfinylundecyl isothiocyanate (V), the last of which has not been previously encountered as a natural compound.

ω-Methylthioalkylglucosinolates and some oxidized congeners in seeds of Erysimum rhaeticum

Abstract The glucosinolates in seeds of Erysimum rhaeticum Schleich. ex DC. have been identified by structure analysis of their sulfur-containing enzymic hydrolysis products, comprising 5-methylthiopentyl and 6-methylthiohexyl isothiocyanate, the corresponding 3-hydroxylated isothiocyanates, and the sulfoxides and sulfones of the latter. The phytochemical results are evaluated in terms of their possible taxonomic significance.

Glucosinolates in Lepidium species from Queensland

Abstract The sole glucosinolate in the seed-bearing portion of Lepidium bonariense L., collected in Queensland, is shown to be p -methoxybenzylglucosinolate (IV). Seed material of L. hyssopifolium Desv., collected in Queensland, contains solely 3,4,5-trimethoxybenzylglucosinolate (V). A previous report on the presence of benzylglucosinolate in L. hyssopifolium is discussed.

Glucosinolates in Lepidium bonariense L.

Abstract The major glucosinolate in seeds of the South American crucifer Lepidium bonariense L. is shown to be the p -hydroxybenzylglucosinolate (glucosinalbate) ion (Ia), isolated as the tetramethylammonium salt and characterized as a potassium salt of the corresponding pentaacetate. The second, and minor, glucosinolate undergoes enzymatic hydrolysis with the production of p -methoxybenzyl isothiocyanate, typically formed from p -methoxybenzylglucosinolate (glucoaubrietin) (Ib). The seeds also contain sinapine, isolated as the thiocyanate. These results are at variance with a recent literature report on the glucosinolates in L. bonariense .